Some grains in Ryugu had an oxygen-17/18 ratio that matched that of AGB stars. Only one grain high in oxygen-18 showed a ratio consistent with a supernova. Traveling through deep time and space.

Nature - Variations of Oxygen-18/Oxygen-16 and Carbon-13/Carbon-12 in the Calcium Carbonate Pleistocene Varved Clays from Toronto, Canada Skip to main content Thank you for visiting nature.com.

Oxygen isotopes. Now, Paltiel and colleagues have shown that nuclear spins are also relevant to CISS. The researchers set up two experiments involving three stable isotopes of oxygen. These are oxygen ...

THE relative differences in the ratios oxygen-18 to oxygen-16 and carbon-13 to carbon-12 of some hundred and fifty carbonate rocks, including fourteen sedimentary limestones, ninety metamorphic ...

In the 3.4-billion-year-old zircons, the team measured ratios of oxygen-18 to oxygen-16 that were as low as 0.1 per mil — a measurement of the ratio of those isotopes when compared to a standard ...